Question

For a black body, the absorptive power is -

• A. $1.0$
• B. $1.5$
• C. $0.5$
• D. $0.8$

Answer 1

The correct option is A $1.0$

Absorptive power is defined as,

$a=\frac{\text{Energy absorbed}}{\text{Energy incident}}$

A black body is an idealized physical body that absorbs all incident electromagnetic radiation.

$\therefore \text{Energy absorbed}=\text{Energy incident}$

$\Rightarrow a=1$

Hence, option $\left(A\right)$ is the correct answer.